Production of ammonium sulfate



W. A. SLOSS.

PRODUCTlON O'F AMMONlU M SULFATE.

APPLICATION FILED MAY 22, 1919.

Patented Jan. 20, 1920 v1 III]! III INVENTQR fibd. MAM

ATTORNEY onrrnn WILLIAIJZ A. SLO

PRG'E'ITCTIGH 75 23.1

1,32%,31-2. v Specification oinett z Application filed may 22,

of ammonium sulfate which shall not be acid and shall be free from pyridin bases. 7

The object of the. invention is to produce such sulfate in an economi'al and efiicient manner Without'ivaste of the original crystals.

In the production of ammonium sulfate as a by-productfrom illuminating gas manufacture and c.0ke-worl-:s it has been customary to pass the gases containing ammonia through saturater bath of sulfuric acid solution whereupon ammonium sulfate is formed and is precipitated when the concentration reaches the proper amount. These crystals are collected and the surplus liquor is drained off or removed in a centrifuge. Some of the acid mother liquor clings to the surfaces of the crystals and. being hygroscopic, causes the crystals 'to absorb moisture especially when the air is damp.

lyridin bases also enter the saturator bath and either unite with the. sulfuric acid and are precipitated orhecome mixed with the aimnonium sulfate crystals, thereby impart? ing an objectionable odor to the same. By this invention the ammonium sulfate is thoroughly dried and neutralized and the pyridin bases are removed therefrom While the amount of ammonium sulfate actually incrcascd over that usually obtained the ordinary course or manufacture. I

This invention is applicable to ammonium sulfate produced from any source where it contains acid, pyridin hases, sultates oi pyriclin-bases, or either or all of these or similar deleterious substances In carrying out this. invention the ammonium sulfate to be treated is heated in any convenient Way to the proper temperature and is treated with ammonie, ammonia vapors, or ammonium hyclroxid to neutralize the excess acid and to decompose the sulfates of the pyridir bases thereby formin ammonium sulfate While the pyridin bases, being Yolatiie at the temperature which is maintamed, will he reinoved.

The invention will unclerstoot from tainer.

company i through one t; which the p o In this tire-Wig resents rollers can be gear mounted a chaml; 1g coil 5. r; into the chainh the coil 5,

tor ammonia, turn niuzn hydro: vided with a i c closed at its inner 11. The pipe, 9, half way into the cont.' viciecl with a se through which the flYl'fliOL into the container '1.

The operatio ammonium suit purified in oclu' through openin 8. started to revo slowly travel are tin-nee ir time air Wi ceptacle 4, to into the end of dry the inonia. ammonia tire; (I passing out of into contact with fate to neiuvraliz and form amino; volatile and ist'n vi no material. T the su i these monim'n 5' lower end and purified 2" quantity is fi 13 in re bases To removes the nu are carried by t ing 8.

W hat! claim and desire to secure by Letters Patent is 1. The process of purifying ammonium sulfate which comprises heating commercial ammonium sulfate, and treating the same with ammonia while it is still hot;

2. The process of purifying ammonium sulfate which comprises heating con'nnercial ammonium sulfate to a temperature abovethatat which pyridin becomes volatile, and treating the same with ammonia while said temperature is maintained.

3. The process, of purifying ammonium sulfate which comprises heating ammonium sulfate, which contains pyridin, to a temperature above that at which pyridin becomes volatile, and treating the same with ammonia while said temperature is maintained.

4:. The process of purifying ammonium sulfate which comprises heating ammonium sulfate, which contains pyridin, to a tem- 5. The process of purifying ammonium sulfate which comprises heating ammonium sulfate, which contains pyridin and free acid, and treating the same with ammonia a temperature that the pyridin will be re moved.

lhe process of purifying ammonium sulfate which comprises heatlng a mixture containing ammonium sulfate, free sulfuric acid, and sulfates of \'1l(lln bases with sutli- -cient ammonia to neutralize the sulfuric acid and decompose the pyridin sulfate. at such a temperature that the liyridin will be Volatilizcd.

S. The process of purifying ammonium sulfate which comprises simultaneously passing hot air and ammonia vapor along" the surface of commercial ammonium sulfate.

In testimony whereof I aliix my signature.

WILLIAM A. *sLoss. 

